Answer:

The mean average monthly temperature in City 1 is 48.75°F.

The mean absolute deviation for the average monthly temperature in City 1 is 13.375°F
Explanation:
For this case we have the following dataset given:
Average Monthly Temperatures for City 1 (° F)
30, 38, 66, 78, 47, 75, 35, 45, 56, 29, 49, 37
Average Monthly Temperatures for City 2 (° F)
15, 23, 51, 63, 32, 60, 20, 30, 41, 14, 34, 22
For this case the sample mean can be calculated with the following formula:

And replacing we got:

The mean average monthly temperature in City 1 is 48.75°F.
And now we can calculate the following values:












And the mean absolute deviation is given by:

The mean absolute deviation for the average monthly temperature in City 1 is 13.375°F